Ok so I just started messing with Palmer, and it works ok, except for the separate layers not exactly matching up due to resizing them separately.
This leads to bright green or red colours that are underneath slightly showing through. on the layer edges.
But darkken yours don't do that, so I had a look, and it seems that you have the full image underneath the layers too.
So is it that your layer edges arn't matching, but it is just less obvious coz you got rid of the bright colors? Dunno if that's a good solution.
Unless you did this some other way?